dorfan



1956 M. 1. DORFAN AIR FILTERING APPARATUS 3 Sheets-Sheet 1 Filed March 23, 1954 INVEN TOR. M0kT0/v I DORF/WV ///r Amen/5y? Jan. 24, 1956 DORFAN 2,732,030

' AIR FILTERING APPARATUS Filed March 25, 1954 3 Sheets-Sheet 2 INVENTOR. Mam/v A vamwv arr w/vim United States Patent AIR FILTERING APPARATUS Morton I. Dorfan, Pittsburgh, Pa. Application March 23, 1954, Serial No. 413,152

7 Claims. (Cl. 183-58) This invention relates to industrial apparatus for filtering dust and the like from air, and more particularly to a novel means for supporting the bags that do the filtering.

Dust collecting apparatus of the type disclosed herein is well known. It consists of a housing in which a number of long bags made from filtering material are suspended from their upper ends. The lower ends of the bag are open and are anchored in fixed position. The upper ends are closed and are supported by hangers from a frame that periodically is vibrated to shake the dust adhering to the bags out of their lower ends. In the past it has been customary to make the bag hangers from rods that are bent to form hooks at their lower ends. The bottoms of the hooks are straight and horizontal and extend through loops in the upper ends of the bags. The loops are formed by folding over the ends of the bags and stitching them down. Dust collects in these loops and, due to the shaking operation, is ground between the loops and hanger hooks so that the loops are worn through in a short time.

It is among the objects of this invention to provide dust collecting apparatus in which the bag hangers and the upper ends of the bags are so constructed and connected that the life of the bags is prolonged greatly. and in which the shaker frame is constructed and vibrated in an improved manner.

In accordance with this invention, the upper end of each bag is provided at one side with an inverted pocket. This pocket is formed between one side of the bag and the central area of a portion of the bag which is folded down over that side. At opposite sides of that central area the folded-down portion is fastened to the side of the bag in any suitable manner. The inverted pocket therefore is open at its bottom and is self cleaning. Projecting up into this pocket and engaging its upper end to support the bag is a loop formed on the lower end of a metal hanger. At the side of the loop outside of the pocket, the hanger has a connecting portion that is joined to the bottom of the loop and to the lower end of a vertical shank that extends upward above the bag. The upper portion of this shank is threaded so that it can be suspended from a shaker frame. Preferably, the shank below the threaded portion is non-circular in cross section and extends through a hole of the same shape to prevent the hanger from turning in the frame. The shaker frame is mounted on pivot pins and is vibrated by means pivotally connected with it in a novel manner.

The preferred embodiment of the invention is illustrated in the accompanying drawings, in which Fig. 1 is a fragmentary section through dust collecting apparatus using my hangers;

Fig. 2 is a vertical section taken on the line 11-11 of Fig. 1;

Fig. 3 is an enlarged fragmentary horizontal section, taken on the line 111-111 of Fig. 1.

Fig. 4 is an enlarged side view of a hanger supporting the upper end of a filter bag; and

Fig. 5 is a vertical section taken on the line VV of i side of a bracket 9 suspended from the bars. Rigidly mounted on the central portion of the shaft is an eccentric 11 that rotates in a collar 12. Rotatably mounted in opposite sides of the collar there are pins 13 that connect it to pairs of links 14 which extend outward in opposite directions toward the ends of the angle bars.

The outer ends of each pair of links are mounted on a pin 16 rotatably mounted in the lower end of a block 17 slidable between the bars and projecting above them. The upper end of the block is welded between a pair of parallel horizontal bars 18 that are connected to the opposite sides of the lower ends of a series of rockers 19 by pins 21 rotatably mounted therein. The upper parts of these rockers are oscillatably mounted on pins 22 projecting from the upper ends of straps 23 which have their lower ends secured to one of the underlying angle bars 1. Consequently, when the eccentric 11 is rotated in collar 12, the links 14 reciprocate bars 18 and thereby rock the rockers on pins 22.

Secured to the opposite edges of each rocker are the central portions of a pair of horizontal channels 25. As shown in Fig. 2, the opposite ends of these channels are similarly attached to end rockers 26 oseillatably mounted on pins 27 projecting from angle bars 28 extending along the opposite sides of the housing. At spaced intervals along the channels their horizontal flanges are provided with vertically aligned openings, through which hangers extend.

Each hanger is formed from a metal rod that is bent into the shape that now will be described. The hanger has a straight shank 31, the upper portion of which is threaded so that nuts 32 can be screwed onto it to clamp the hanger in the upper flange of the channel that supports it. Below the threads the shank is noncircular in cross section and the lower flange of the channel has a hole of the same shape in order to prevent the hanger from turning in the channel, as shown in Fig. 3. Preferably, the non-circular shape is provided by forming integral ribs 33 along opposite sides of the shank. By keeping the hangers from turning, the bags can always be correctly oriented relative to the direction of shaker frame movement in order to obtain the full benefit of the shaking.

Spaced directly below the lower end of the hanger shank, there is a loop 35 that is formed by bending the lower end of the rod. As shown in Fig. 5, the bottom of the loop is integrally connected at its center to a laterally offset portion 36 of the rod which extends up beside the loop a short distance from it and then is inclined back over the loop to join the lower end of the shank. This construction places the lop in line with the shank, but leaves a space with an open top between the loop and the offset portion 36. For best results, the loop is rectangular in shape with a straight horizontal upper part, as shown in Fig. 4.

The bag 40 that this hangersupports is made of suitable filter cloth and has its upper end folded or doubled over. The end areas of this folded-down portion are fastened to the side of the bag by stitching 41 and may be further secured by rivets 42, but the central area of the folded-down portion is not fastened to the side of the bag. Consequently, a pocket 43 is formed between this central area and the adjoining side of the bag, the

3 pocket being open at its bottom and closed at its top. The loop at the bottom of the hanger is inserted in this inverted pocket, with the outer wall of the pocket extending between the loop and the offset portion 36 of the hanger. The'straight upper part of the hanger loop engages the top of the pocket and thereby supports the bag. The loop is large enough to engage a sufficient area of the bag in the pocket to produce a good shaking action when the shaker frame is vibrated. On the other hand, since the pocket opens downwardly, it is self-cleaning and dust will not accumulate between the hanger loop and the bag and wear through the bag. The result is that the bag will last much longer than the bags that have been used with hangers of the construction known heretofore.

According to the provisions of the patent statutes, I have explained the principle of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

I claim:

1. In air filtering apparatus, a vertical filter bag having an open lower end and a closed upper end, said upper end being provided at one side with an inverted pocket open at the bottom, a metal hanger supporting the upper end of the bag, said hanger having a vertical shank formed for suspension by its upper end, and an integral vertical loop at the lower end of the shank, the loop projecting up into said pocket through its open bottom and having an upper portion engaging the top of the pocket to support the-bag.

2. Apparatus according to claim 1, in which the hanger includes a portion spaced from one side of the plane of the loop and joined to the lower end of the shank and the bottom of the loop.

3. Apparatus according to claim 1, in which said pocket is formed between the central area of a folded-down portion of the bag and the adjoining side of the bag, the areas of said folded-down portion at opposite sides of said central area being permanently fastened to said side of the bag.

4. In air filtering apparatus, pairs of parallel channels having horizontal flanges, parallel rockers between the opposite ends ofv each pair of channels and supporting them, stationary means at the ends of the channels, pivot pins mounted in said means and supporting the rockers, a rocker supported by the central portions of each pair of channels and projecting below them, a horizontal bar beside the lower ends of the center rockers, pivot pins connecting the bar with the center rockers, means for reciprocating said bar rapidly longitudinally to oscillate said rockers, and filter bag hangers carried by said channel flanges.

5. In air filtering apparatus, pairs of parallel channels having horizontal flanges, parallel rockers between the opposite ends of each pair of channels and supporting them, stationary means at the ends of the channels, pivot pins mounted in said means and supporting the rockers, a rocker supported by the central portions of each pair of channels and projecting below them, horizontal bars extending across the opposite sides of the lower ends of the center rockers, pivot pins extending through the bars and center rockers to connect them together, a vertical member rigidly mounted at its upper end between said bars, a link pivotally connected to the lower end of said member and extending away from it beneath the bars, means operatively connected to the opposite end of the link for reciprocating it rapidly longitudinally, whereby said bars and channels are vibrated, and filter bag hangers carried by said channel flanges.

6. A bag hanger for air filtering apparatus, comprising a straight vertical shank having a threaded upper portion adapted to be suspended from a support, a vertical loop directly below the shank, and a laterally oflset connecting portion spaced from one side of the plane of the loop and integrally connected to the lower end of the shank and to the bottom of the loop, the loop having a straight horizontal top portion forming a bag-supporting surface.

7. In air filtering apparatus, a vertical filter bag having an open lower end and a closed upper end, said upper end being provided at one side with an inverted pocket open at its bottom, a metal hanger supporting the upper end of the bag and having a vertical shank provided with a non-circular portion, a support provided with a hole receiving said shank, said hole conforming in size and shape to said non-circular portion of the shank to prevent the shank from rotating in said support, means fastening the upper end of the shank to the support, and an integral vertical loop at the lower end of the shank projecting up through the open bottom of said pocket and having an upper portion engaging the top of the pocket to support the bag.

References Cited in the file of this patent UNITED STATES PATENTS 2,137,254 Turnbull Nov. 22, 1938 2,143,664 Snyder Ian. 10, 1939 2,576,259 McGuire Nov. 27, 1951 2,612,236 Vedder Sept. 30, 1952 

